The Quarterly journal of the Geological Society of London . slightly micaceous and in part somewhat cleaved. At twopoints numerous poorly-preserved graptolites were found, some ofwhich Mr. John Pringle has been able to determine as Diplo-graptus (Amplexograptus) arctus Elles & Wood, cf. Diplo-oraptus (Ghjptof/raptus) fcrefiasafJas (Hisinger), and Clima-cograptits sp. Mr. Pringle adds : The forms identified as Diplograptus (Amplexograptus) arctus E. & W.•occur in some profusion, and they suggest strongly that the shales occupy acorresponding position to that of the Mydrim Limestone of South Wal


The Quarterly journal of the Geological Society of London . slightly micaceous and in part somewhat cleaved. At twopoints numerous poorly-preserved graptolites were found, some ofwhich Mr. John Pringle has been able to determine as Diplo-graptus (Amplexograptus) arctus Elles & Wood, cf. Diplo-oraptus (Ghjptof/raptus) fcrefiasafJas (Hisinger), and Clima-cograptits sp. Mr. Pringle adds : The forms identified as Diplograptus (Amplexograptus) arctus E. & W.•occur in some profusion, and they suggest strongly that the shales occupy acorresponding position to that of the Mydrim Limestone of South Wales. In Miss Elless1 classification these beds belong to the zone ofNemayraptus gracilis. In both localities the fossils were obtained from shale lying only?a short distance above the ore. In shale from Adit No. L369 feet above , the graptolites are seen on one side andpyrites on the other, whence it follows that the specimen is from 1 Q. J. G. S. vol. lxv (1909) p. 172. JMap and section, on identical scales, of the Trefriw pyrites GEOLOGICAL MAP OF TREFRIW ORE-DEPOSIT. Scale:- 6 inches to 1 mile, or 1:10,560. A. 9° W. of S. Top ofIncline B. 9° N. Road toConway


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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology